Industrial machines, excavator and bulldozer at a construction site load sifted sand and soil into a very large dump truck. Panorama of construction work.close-up of working construction machinery The dump truck at a construction site unloads the sand and gravel from the builder. Close-up of dump truck unloading. Construction concept. A pile of gravel. Great for any video presentation showcasing: road works, bulldozers, trucks, road construction.